High-precision voltage measurement IP core for battery management SoC of electric vehicles

This paper presents a design of high precision voltage measurement IP core for aware battery management SoC which is the key chip of Battery Management System (BMS) in electric vehicles. To meet the battery voltage detection requirements of high precision, synchronization and speed, a voltage detecting circuit which collects voltage of each battery cell precisely and synchronously is presented. To verify the circuit, a BMS test system is designed and built based on PCB. The test results show that the BMS based on the cell voltage measurement design presented in this paper can detect all cell voltages of the battery pack precisely with a maximum error of ±6mV, and synchronization is also considered. The relative measurement error is less than 0.2%. This IP core can be integrated in battery management SoC.